Same thing happened witg ny iphone somehow my iphone synced over to my ipad, all content on the ipad was replaced with my shit of iphone, ios7 came out and all my data was lost once again, ios can be good if you only use one device per account, dont even start me up on that itunes bollox, get titanium bacup for the s4 or a cloud based bacup failing that I have a iphone 4s you can have for the s4